共查询到20条相似文献,搜索用时 937 毫秒
1.
2,4,6-三硝基间苯二酚(斯蒂芬酸)及其盐类,如斯蒂芬酸铅、斯蒂芬酸钡等是常用的含能材料犤1犦,但斯蒂芬酸铅盐及钡盐在爆炸后产生重金属污染,对使用人员的健康及环境都产生危害。同时,斯蒂芬酸铅盐和钡盐存在一些缺陷,如斯蒂芬酸铅对静电敏感、生产不安全等,这就要求人们寻求新的产品来代替它们。近年来钾含能配合物以其低毒性、良好的安定性引起了火工药剂专家和研究人员的重视犤2~9犦,成为了含能材料行业一个重要研究方向。因此,我们选择了斯蒂芬酸与氢氧化钾反应制备了斯蒂芬酸钾,并就其晶体结构及热分解机理进行了研究。1实验部分1.1仪… 相似文献
2.
室温下对苯二甲酸二丙炔醇酯分别与Co2CO8Mo2Cp2CO4和RuCo2CO11反应得到三个有机金属化合物C6H4pCO2CH2C2Hμ2Co2CO621、C6H4pCO2CH2C2H2RuCo2CO922和HC2CH2OCOC6H4pCO2CH2C2HμMo2Cp2CO43。研究发现三种金属核对端炔氢的屏蔽作用依次为RuCo2CO9>Co2CO6>Mo2CO4Cp2。化合物1的晶体衍射发现属三斜晶系空间群a=8.1392b=8.8083c=11.3433β=96.2606°V=773.443Z=1Dc=1.748g·cm-3R=0.0513wR=0.1266。 相似文献
3.
Reaction of anhydrous YbC13 with 2 equiv, of sodium 2,4,6-tri-tert-butylphenoxide (ArONa, Ar=C6H2-t-Bu3-2,4,6) and 2 equiv, of potassium diphenyl amide in THF afforded the first bis(aryloxo) amido-lanthanide complex of (ArO)2Yb(NPh2)2K(THF)4 (1). In 1, the ytterbium and potassium were bridged via diphenyl amido ligands.The ytterbium metal center was coordinated to two oxygen atoms of aryloxide ligands and two nitrogen atoms of diphenyl amido ligands in a conventional distorted tetrahedral fashion, while the potassium interacted in η^2-fashion with two phenyl rings of the diphenyl amido ligands besides four THF molecules. 1 displayed moderate catalytic activities for the polymerization of methyl methacrylate and acrylonitrile. 相似文献
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Reaction of divalent (Ph2N)2Sm(THF)4 with 1 equiv, of azobenzene in THF and then crystallization of the product in DME-Et2O mixed solvent produced the complex of [(PhEN)(DME)Sm]E(μ-η^2:η^2-N2Ph2)2 (1) in 65.0% yield. In complex 1, azobenzene molecules were reduced to be dianionic Ph2N2^2- ligands, bridging two samarium ions in two η^2:η^2 fashions. One samarium ion was bonded to a DME molecule and a diphenyl amido ligand besides two Ph2N2^2- ligands. The unusual Ln-η^2-arene close interaction was found for the first time for diphenyl amido lanthanides. Complex 1 could catalyze the polymerization of methyl methacrylate and acrylonitrile 相似文献
6.
[Cp2Ln(μ-SR)]2 was reacted with Ph2C=C=O to yield ketene mono-insertion products [Cp2Ln(μ-η1:η2-OC(SR)=CPh2)]2 [R=Bn, Ln=Yb (1), Er (2), Y (3) and R--Ph, Ln=Yb (4)], indicating that the reactions of organolanthanide thiolates with ketenes are independent of the nature of the thiolate ligand and the ketene as well as the reaction condition. These reactions could provide an efficient method for the synthesis of organolanthanide complexes with the a-thiolate-substituted enolate ligand. All these complexes were characterized by elemental analysis and spectroscopic properties and the structure of complex 1 was determined through X-ray single crystal diffraction analysis. 相似文献
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The new compound (NH3CH2CH2NH3)2{Na2[μ2-(C6H4O2)2](C6H4OOH)2} has been synthesized and characterized by elemental analysis, IR, UV, NMR and single crystal X-ray diffraction. The yellow crystals crystallized in the triclinic system with space group P-1 and a=0.6091(2) nm, b= 1.0274(3) nm, c= 1.2466(4) nm, α=89.073(6)°, β=89.376(6)°, γ=78.873(5)°, V=0.7653(4) nm^3, Z= 1, R1=0.0568, wR2=0.1198. Every sodium ion coordinates in trigonal prismatic fashion with two O atoms from a terminal chelating catecholato ligand and four O atoms from bridging P2 catecholato ligands, Two neighboring NaO6 trigonal prisms are face-shared and centrosymmetric with regard to the inversion center consisting of four tri-bridging O atoms to form a binuclear cluster {Na2[μ2-(C6H4O2)2]}^2- anion. The comparison of ^13C NMR spectrum of tlie complex in solid state with that in solution indicated that the rapid exchange between the bridging [μ2-(C6H4O2]^2- and terminal [C6H4OOH]^- ligands was present in solution. 相似文献
9.
在无水乙醇中, 使低水合氯化稀土 (RE = Ho, Er, Tm, Yb, Lu) 与吡咯烷二硫代氨基甲酸铵 (APDC)和1,10-菲咯啉 (o–phen•H2O) 反应, 制得其三元固态配合物. 用化学分析和元素分析确定它的组成为RE(C5H8NS2)3(C12H8N2) (RE = Ho, Er, Tm, Yb, Lu). IR光谱说明RE3+ 分别与3个PDC–的6个硫原子双齿配位, 同时与o–phen的2个氮原子双齿配位, 配位数为8. 用精密转动弹热量计测定了它们的恒容燃烧热△cU分别为(-16788.46 ± 7.74), (-15434.53 ± 8.28), (-15287.80 ± 7.31), (-15200.50 ± 7.22)和(-15254.34 ± 6.61) kJ•mol-1; 并计算了它们的标准摩尔燃烧焓△cHmθ和标准摩尔生成焓△fHmθ分别为( -16803.95 ± 7.74), (-15450.02 ± 8.28), (-15303.29 ± 9.28), (-15215.99 ± 7.22), (-15269.83 ± 6.61) kJ • mol-1和 (-1115.42 ± 8.94), (-2477.80 ± 9.15), (-2619.95 ± 10.44), (-2670.17 ± 8.22), (-2650.06 ± 8.49) kJ•mol-1. 相似文献
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The intermolecular potentials for D2, N2, O2, F2 and CO2 are determined on the basis of the second virial coeffincients, the polarizabilities parallel and perpendicular to the molecular axes, and the electric quadrupole moment. The repulsive parts of the potentials are taken from the corresponding Kihara core-potentials. Effects of the octopolar induction are taken into consideration in a unique way. The potential depends on relative orientations of the two molecules as well as the distance r between the molecular centers. This dependence is shown in graphs. A measure of the anisotropy of the potential depth is 0.72 for CO2 0.36 for D2, and smaller than 0.27 for N2 O2 and F2. The remarkable anisotropy for CO2 and D2 is due to strong electrostatic quadrupole interactions. 相似文献
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V. D. Zhuravlev Yu. A. Velikodnyi A. S. Vinogradova-Zhabrova A. P. Tyutyunnik V. G. Zubkov 《Russian Journal of Inorganic Chemistry》2008,53(10):1632-1634
Phase equilibria in the Ba3(VO4)2-K2Ba(MoO4)2 and Pb3(VO4)2-K2Pb(MoO4)2 systems have been investigated. In the first system, a continuous series of substitutional solid solutions with the palmierite
structure is formed, and in the second one, the polymorphic transition in lead orthovanadate at 100°C restricts the extent
of the palmierite-type solid solution to 10–100 mol % K2Pb(MoO4)2.
Original Russian Text ? V.D. Zhuravlev, Yu.A. Velikodnyi, A.S. Vinogradova-Zhabrova, A.P. Tyutyunnik, V.G. Zubkov, 2008, published
in Zhurnal Neorganicheskoi Khimii, 2008, Vol. 53, No. 10, pp. 1746–1748. 相似文献
13.
配合物[Cu(H2O)(C12H8N2)2].2ClO4的合成、性质及晶体结构 总被引:1,自引:0,他引:1
《化学研究与应用》2001,13(5):506-508
合成了配合物[Cu(H2O)(C12H8N2)2]*2ClO4(C12H8N2为1,10-邻菲咯啉),用元素分析、摩尔电导、红外光谱及电子光谱进行了表征,并测定了配合物的晶体结构.该晶体属单斜晶系,空间群为CC;晶胞参数a=1.9177(2)nm,b=0.81994(0)nm,c=1.62458(14)nm,β=100.104(6)°;V=2.5419(4)nm3,Z=4,F(000)=1300,DC=1.693g/cm3,R=0.0430,wR=0.1195.中心铜(Ⅱ)离子与两个1,10-邻菲咯啉的四个N原子和一个水分子的氧原子配位,形成了一个变形的三角双锥结构. 相似文献
14.
Richard R. Schrock 《Journal of organometallic chemistry》1976,121(3):373-379
MMe5(dmpe) (M = Nb or Ta, dmpe = Me2PCH2CH2PMe2) reacts with H2 (500 atm) and dmpe in THF at 60°C to give MH5(dmpe)2? NbH5(dmpe)2 readily reacts with two mol of CO or ethylene (L) to give NbHL2(dmpe)2. The exchange of the hydride ligand with the ethylene protons in NbH(C2H4)2(dmpe)2 is not rapid on the 1H NMR time scale (60 MHz) at 95°C. 相似文献
15.
Marco Häberlen 《Journal of solid state chemistry》2005,178(5):1478-1487
α-Ca3(BN2)2 crystallizes in the cubic system (space group: ) with one type of calcium ions disordered over of equivalent (8c) positions. An ordered low-temperature phase (β-Ca3(BN2)2) was prepared and found to crystallize in the orthorhombic system (space group: Cmca) with lattice parameters: , , and . Structure refinements on the basis of X-ray powder data have revealed that orthorhombic β-Ca3(BN2)2 corresponds to an ordered super-structure of cubic α-Ca3(BN2)2. The space group Cmca assigned for β-Ca3(BN2)2 is derived from by a group-subgroup relationship.DSC measurements and temperature-dependent in situ X-ray powder diffraction studies showed reversible phase transitions between β- and α-Ca3(BN2)2 with transition temperatures between 215 and 240 °C.The structure Sr3(BN2)2 was reported isotypic with α-Ca3(BN2)2 () with one type of strontium ions being disordered over of equivalent (2c) positions. In addition, a primitive () structure has been reported for Sr3(BN2)2. Phase stability studies on Sr3(BN2)2 revealed a phase transition between a primitive and a body-centred lattice around 820 °C. The experiments showed that both previously published structures are correct and can be assigned as α-Sr3(BN2)2 (, high-temperature phase), and β-Sr3(BN2)2 (, low-temperature phase).A comparison of Ca3(BN2)2 and Sr3(BN2)2 phases reveals that the different types of cation disordering present in both of the cubic α-phases () have a directing influence on the formation of two distinct (orthorhombic and cubic) low-temperature phases. 相似文献
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Ai-Min Zhu Qi Sun Jin-Hai Niu Yong Xu Zhi-Min Song 《Plasma Chemistry and Plasma Processing》2005,25(4):371-386
An experimental study on the conversion of NO in the NO/N2, NO/O2/N2, NO/C2H4/N2 and NO/C2H4/O2/N2 systems has been carried out using dielectric barrier discharge (DBD) plasmas at atmospheric pressure. In the NO/N2 system, NO decomposition to N2 and O2 is the dominating reaction; NO conversion to NO2 is less significant. O2 produced from NO decomposition was detected by an on-line mass spectrometer. With the increase of NO initial concentration, the concentration of O2 produced decreases at 298 K, but slightly increases at 523 K. In the NO/O2/N2 system, NO is mainly oxidized to NO2, but NO conversion becomes very low at 523 K and over 1.6% of O2. In the NO/C2H4/N2 system, NO is reduced to N2 with about the same NO conversion as that in the NO/N2 system but without NO2 formation. In the NO/C2H4/O2/N2 system, the oxidation of NO to NO2 is dramatically promoted. At 523 K, with the increase of the energy density, NO conversion increases rapidly first, and then almost stabilizes at 93–91% of NO conversion with 61–55% of NO2 selectivity in the energy density range of 317–550 J L−1. It finally decreases gradually at high energy density. A negligible amount of N2O is formed in the above four systems. Of the four systems studied, NO conversion and NO2 selectivity of the NO/C2H4/O2/N2 system are the highest, and NO/O2/C2H4/N2 system has the lowest electrical energy consumption per NO molecule converted. 相似文献
18.
H.J. Breunig O. Moldovan U. Rosenthal R.A. Varga 《Journal of organometallic chemistry》2011,696(2):523-526
Reactions of [Cp2Ti(btmsa)] (btmsa = bis(trimethylsilyl)acetylene) with R4Sb2 (R = Me, Me3Si) give [Cp2TiSbMe2]2 (1) or [Cp2TiSb(SiMe3)2]2 (2) respectively. [Cp2TiCl]2·2Mes4Sb2 (3) is serendipitously formed from [Cp2Ti(btmsa)] and Mes2SbH containing NH4Cl traces. 相似文献
19.
Zoe A.D. Lethbridge 《Journal of solid state chemistry》2003,172(1):212-218
Three manganese oxalates have been hydrothermally synthesized, and their structures determined by single-crystal X-ray diffraction. MnC2O4·2H2O (I) is orthorhombic, P212121, , , , , Z=4, final R, Rw=0.0832, 0.1017 for 561 observed data (I>3σ(I)). The one-dimensional structure consists of chains of oxalate-bridged manganese centers. [C4H8(NH2)2][Mn2(C2O4)3] (II) is triclinic, , , , , α=81.489(2)°, β=81.045(2)°, γ=86.076(2)°, , Z=1, final R, Rw=0.0467, 0.0596 for 1773 observed data (I > 3σ (I)). The three-dimensional framework is constructed from seven coordinate manganese and oxalate anions. The material contains extra-framework diprotonated piperazine cations. Mn2(C2O4)(OH)2 (III) is monoclinic, P21/c, , , , β=91.10(3)°, , Z=1, final R1, wR2=0.0710, 0.1378 for 268 observed data (I>2σ (I)). The structure is also three dimensional, with layers of MnO6 octahedra pillared by oxalate anions. The hydroxide group is found bonded to three manganese centers resulting in a four coordinate oxygen. 相似文献
20.
Three new compounds Ca(HF2)2, Ba4F4(HF2)(PF6)3 and Pb2F2(HF2)(PF6) were obtained in the system metal(II) fluoride and anhydrous HF (aHF) acidified with excessive PF5. The obtained polymeric solids are slightly soluble in aHF and they crystallize out of their aHF solutions. Ca(HF2)2 was prepared by simply dissolving CaF2 in a neutral aHF. It represents the second known compound with homoleptic HF environment of the central atom besides Ba(H3F4)2. The compounds Ba4F4(HF2)(PF6)3 and Pb2F2(HF2)(PF6) represent two additional examples of the formation of a polymeric zigzag ladder or ribbon composed of metal cation and fluoride anion (MF+)n besides PbF(AsF6), the first isolated compound with such zigzag ladder. The obtained new compounds were characterized by X-ray single crystal diffraction method and partly by Raman spectroscopy. Ba4F4(HF2)(PF6)3 crystallizes in a triclinic space group P1¯ with a=4.5870(2) Å, b=8.8327(3) Å, c=11.2489(3) Å, α=67.758(9)°, β=84.722(12), γ=78.283(12)°, V=413.00(3) Å3 at 200 K, Z=1 and R=0.0588. Pb2F2(HF2)(PF6) at 200 K: space group P1¯, a=4.5722(19) Å, b=4.763(2) Å, c=8.818(4) Å, α=86.967(10)°, β=76.774(10)°, γ=83.230(12)°, V=185.55(14) Å3, Z=1 and R=0.0937. Pb2F2(HF2)(PF6) at 293 K: space group P1¯, a=4.586(2) Å, b=4.781(3) Å, c=8.831(5) Å, α=87.106(13)°, β=76.830(13)°, γ=83.531(11)°, V=187.27(18) Å3, Z=1 and R=0.072. Ca(HF2)2 crystallizes in an orthorhombic Fddd space group with a=5.5709(6) Å, b=10.1111(9) Å, c=10.5945(10) Å, V=596.77(10) Å3 at 200 K, Z=8 and R=0.028. 相似文献